memory bandwidth on Athlon systems
Guignon Thomas
guignon at asci.fr
Wed Jul 19 08:03:55 PDT 2000
Hello,
We have recently received an Athlon 700 system (Abit KA7 + 2 x 512M
pc100) and stream benchmark give poor results (even when using
turbo mode) compared to my old K7M with an Athlon 600. Here
are the results:
zephyr: 700 kx133 pc100 turbo (2x512) ABIT KA7
-------------------------------------------------------------
This system uses 8 bytes per DOUBLE PRECISION word.
-------------------------------------------------------------
Array size = 999936, Offset = 0
Total memory required = 24.9 MB.
Each test is run 10 times, but only
the *best* time for each is used.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Function Rate (MB/s) RMS time Min time Max time
Copy: 302.8281 0.0529 0.0528 0.0530
Scale: 300.8701 0.0533 0.0532 0.0533
Add: 342.1093 0.0703 0.0701 0.0714
Triad: 338.7202 0.0709 0.0709 0.0709
copernic: 600 amd750 pc100 (1x128) ASUS K7M
-------------------------------------------------------------
This system uses 8 bytes per DOUBLE PRECISION word.
-------------------------------------------------------------
Array size = 999936, Offset = 0
Total memory required = 24.9 MB.
Each test is run 10 times, but only
the *best* time for each is used.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Function Rate (MB/s) RMS time Min time Max time
Copy: 358.9613 0.0447 0.0446 0.0450
Scale: 436.5540 0.0367 0.0366 0.0368
Add: 447.4549 0.0537 0.0536 0.0537
Triad: 451.6738 0.0533 0.0531 0.0535
As you see the old system is by far superior to the new one.
I wonder if anyone has some experience with the Abit KA7 to help me
solving this problem?
A+
--
Thomas Guignon (guignon at asci.fr)
Laboratoire ASCI, ORSAY(France), www.asci.fr
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